Muffler



W. KRAFVE.

MUFFLER.

APPLICATION FILED MAY8,1920.

1,396,583. Patented Nov. 8, 1921.

2 SHEETS-SHEET l.

W. KRAFVE.

MUFFLER.

APPLlCATlDN FILED IMY a. 1920.

Patented Nov. 8, 1921.

2 SHEETS-SHEET 2- UNITED stares Par- Ltd

at orrics- MUFFLER.

Specification of Letters Patent.

Patented Nov. 8, 1921.

Annh'cation filed May 8, 1920. Serial No. 379,751

To aZZ coll-02a e't' may Be it known concern that I, lVILLiAM Knarwi, acitizen of the United States, residing at F all River, in the county ofBristol and State of h ilassachusetts, have invented new and usefulImprovements in Mufflers, of which the following is a specification.

This invention relates to certain new and useful improvementsinmufllers, and pertains to mufllers for use in connection with internalcombustion engines. e

The primary object of the invention is to provide a multler which iscomposed of but two castings suitably connected so as to be capable or"easy and quick assemblage and disconnection thereby to allow ofcleaning, and to further provide a mufiler which is effective inoperation and highly efficient for the purpose.

' Further, the invention aims to provide a mufiler in which the exhaustgases are caused to travel in a spiral path prior to egrcssin Stillfurther and other objects will be later set forth and manifested in thecourse of the following description.

In the drawings:

Figure l, is a side elevation of the invention;

Fig. 2 is a section on line 22 of Fig. 1;

Fig. 3, is a top plan view of the interior of one half of the device andFig. 4, is a bottom plan view of the interior of the other hal nproceeding in accordance with the present invention, two castings areemployed one of which 1, of tubular form providing either an inlet or anoutlet as desired, which connection extends outwardly from the thecasting 1, and communicates with the center of the interior of thecasting. The preferably circular marginal a peripheral connection 4,extending outwardly from the wall 3. On its interior, the casting isformed with a spiral wall or partition 5, forming a spiral passage forthe exhaust gases, the wall 5, terminating at one end at one side tion4, and at its opposite end in partial surrounding relation to theconnection 2, as indicated at 6, in Figs. 2 and 4. The upper edges ofthe wall 3 and the spiral wall 5, are convex in form as depicted in Fig.2 at 7 for the purpose of nesting in havin an L-connection 2 b 7 ofconnecthe concave free edges 8, of the spiral wall 9, and marginal wall10, or" the complementary casting 11. he casting 11, is a duplicateofthe casting l, excepting as to the connection 2, which latter isomitted in the casting-ll. he casting 11 further has a connection 12,which is complementary to the connection 4, of

the other casting l, the two connections mating toform a completelytubular inlet or outlet as desired and as depictedin Fig. 2, of thedrawings.

The two castings are held together by means of bolts 13, having nuts 14,which bolts pass through suitable openings formed for tl i the twocastings. The castings further each have a base portion 15, which latterconjointly form a base for supporting the entire device in position.

In operation, the exhaust gases from the engine may be admitted to themuiller either at the center thereof by conducting the gases toconnection 2, or tl mitted to the conducting formed by the partsinstance, the gases are caused to pursue a spiral path of travel fromthe point of ingress to the point of egress, whereby the gases areeffectually muflled or silenced.

It will further be seen that by removing the nuts 14 the two castingsmay be separated and cleaned and then easily reassembled.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 2* 1. In a mufiler, a pair of castings, eachhaving a flat wall and a substantially circular'marginal wall, a spiralwall in each casting connected to the flat wall thereof, a connectionextending from the flat wall of one casting and communicating with thecenter of the interior of the casting, complementary connections leadingperipherally of the marginal walls of the castings and connecting to theouter end of the spiral passage, the spiral walls having concave andconvex edges nested one within the other, fastening bolts passed throughthe two castings to secure same together, and complementary baseportions extending peripherally from the castings, said spiral wallsbeing each continuous and at one end leading form one side of theperipheral coning means for securing the castings together Y spiralWalls engaging means between nections, and at the opposite endterminating in partial surrounding relation to the center connections.

2. In a mufiler, a pair of castings having central inlet and peripheraloutlet connections, each casting having a spiral Wal forming a spiralpassage, said Walls having abutting and nesting concave and convexedges, and fastening means passed through the castings for securing gametogether said being each continuous and at one end leading from one sideof the peripheral connectlons and at the opposite end terminating inpartial surrounding relation to the center connections. I

' 3. Ina mufiler, two castings each having a piral wall forming a spiralpassage,inter the adjacent edges of the adjacent Walls, a central inletand a peripheral outlet connected to the respective ends of the spiralpassage, and fastensaid spiraltwalls being each continuous and at oneend leading from one side of the peripheral connections and at theopposite end terminating in partial surroundingrelation to the centerconnections. 7 I. In a mufller, a pair of castings each having a spiralWallr'orm sage, said Walls being in ing a spiral pas- V abuttingengagement at their free edges,

fastening means to hold the sections together, and a central inlet-and aperipheral outlet connection ex:

tending from the respective ends of the spiral passage, said spiralwalls being each continuous and at one end leading from one side of theperipheral connections and at the opposite end terminating in partialsurrounding relation tothe center connections.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

WILLIAM KRAFVE Witnesses:

E. PLTOOYLYLEY, 4 J. A. Mir am;

